code: def recognize_video_ext(self, ext=""):
      if ext == "mp4":
          return cv2.VideoWriter_fourcc(*"mp4v"), "." + ext
      elif ext == "avi":
          return cv2.VideoWriter_fourcc(*"XVID"), "." + ext
      elif ext == "mov":
          return cv2.VideoWriter_fourcc(*"XVID"), "." + ext
      else:
          print(
              "Unknow video format {}, will use .mp4 instead of it".format(
                  ext
              )
          )
          return cv2.VideoWriter_fourcc(*"mp4v"), ".mp4"
  
imports: import os
  import time
  from queue import Queue
  from threading import Thread
  import cv2
  import numpy
  import torch
  import torch.multiprocessing
  from alphapose.utils.pPose_nms import pose_nms, write_json
  from alphapose.utils.transforms import get_func_heatmap_to_coord
  import norfair
label_desc: Use image node_id 16 for calling the DataWriter obj's underlying member method code with example usage: obj.recognize_video_ext(ext) and returns: cv2,  unknown, cv2,  unknown, cv2,  unknown, cv2,  str